//
//  XYCalculatorModel.h
//  Calculator
//
//  Created by Xia Yong on 12-12-5.
//  Copyright (c) 2012年 Xia Yong. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface XYCalculatorModel : NSObject

@property (strong, nonatomic) NSMutableArray *data;

- (double) calculate:(NSString *) sign;

- (void) addNumber:(NSNumber *) number;

@end
